Tool for cutting thread.



S. A. LARSON.

TOOL FOR CUTTING THREAD.

APPLIOATION run my 18, 1911.

1,003,922. Patented Sept. 19,1911.

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1N1) NTOR SANFORD .A'. LARSON, 01? DENVER, COLORADO.

TOOL FOR CUTTING THREAD.

Specification of Letters Patent.

Application filed May 18, 1911.

Patented Sept. 19, 1911.

Serial No. 627,951.

To all whom it may concern:

Be it known that I, SANFORD A. LARSON, a citizen of the United States,residing at Denver, in the county of Denver and State of Colorado, haveinvented certain new and useful Improvements in Tools for CuttingThread; and I do hereby declare the following to be a full, clear, andexact description of the invention, such as will enable others skilledin the art to which it appertains to make and use the same, referencebeing had to the accompanying drawings, and to the letters and figuresof reference marked thereon, which form a part-of this specification.

This invention relates to new and useful improvements in devices forcutting threads upon pipes, which may be inconveniently located for theemployment of the usual dies for this purpose.

The invention comprises various details of construction and combinationsand arrangements of parts which will be hereinafter fully described andthen specifically defined in the appended claim.

I illustrate my invention in the accompanying drawings, in which Figure1 is a side elevation showing the application of my device in readinessfor use. Fig. 2 is a central longitudinal sectional view, and Fig. 3 isan end view.

Reference now being had to the details of the drawings by letter, Adesignates a shell which is adapted to telescope within the pipe uponthe circumference of which the threads are to be cut. Said shell hasslots A formed therein so that the part thus slotted may be expanded forthe purpose of frictionally holding the device within a p1 e.

In Fig. 1 of the drawings, I have shown in dotted lines the pipe,designated by letter B, within which the device is held. A flanged plugD is fitted in one end of the shell, and E is a sleeve having a threadedportion E upon the circumference thereof and adapted to fit the threadsof a die, designated by letter F. Said shell is made preferably of asoft metal and a screw H is passed through registering apertures in thesleeve and shell and engages a threaded hole in the plug D. A screw,designated by letter K, passes through the plug andhas a head K and isthreaded at K for the recepplace. A die F may be turned by a wrench orany other suitable tool. and the threads upon the sleeve serve asfeeding means for feeding the die over the tread on to the cir-'cumference of the pipe.

It will thus be seen that, by the provision of a device as shown anddescribed, a simple mechanism is afforded whereby threads may be cutupon the circumference of a pipe which may be located in an inaccessibleplace where the ordinary cutting die with rod or handle connectionscould not be well used.

What I claim to be new is A thread cuttin% device comprising a shellwith split end, a anged plug fitted within the shell and centrallyapertured, a headed screw passing through the plug, an expanding nutupon the screw forming means for holding the shell within the plug, asleeve telescoping over said shell and having a portion thereof threadedand an unthreaded portion, the end of which abuts against the flange ofsaid plug and its circumference flush with the edge of the flange, and ascrew passing through registering apertures in said sleeve and shell andengaging a hole in the plug.

In testimony whereof I hereunto aflix my signature in the presence oftwo witnesses.

SANFORD A. LARSON.

Witnesses:

GEO. ANnERsnN, BEARNEY KNUDSEN.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents, Washington, D. G.

